Here is an idea of appearances inspired by FullMetal Alchemist, it is a tribute to the various characters of the universe of this anime.

1) Scylla-Proud Child

Scylla become a mysterious boy with dark tentacles and contemporary costume.

2) Ne Zha- Fullmetal

Inspired by Edward Elric from FullMetal Alchemist.

3) Bakasura- Can i eat it ?

4) Loki- Envious


5) Hercules - Living armor

6) Tyr- Ultimate eye

7) Neith- Hawkeye

8) Da ji -Lust